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Significant Accounting Policies - Quality Incentive Premium Revenue Recognized (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Schedule of Premium Revenue by Health Plan Type [Line Items]
Maximum available quality incentive premium - current period	$ 47	$ 48	$ 138	$ 135
Quality incentive premium revenue recognized in current period:
Earned current period	46	39	109	97
Earned prior periods	5	9	35	32
Total	$ 51	$ 48	$ 144	$ 129
Quality incentive premium revenue recognized as a percentage of total premium revenue	1.20%	1.10%	1.20%	1.00%
Select Health Plans \| Minimum
Schedule of Premium Revenue by Health Plan Type [Line Items]
Percentage of additional incremental revenue earned			1.00%
Select Health Plans \| Maximum
Schedule of Premium Revenue by Health Plan Type [Line Items]
Percentage of additional incremental revenue earned			4.00%